279 823 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁸

TF target 2⁴⁴

TF below 2^102 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	137000000
B2 =	2811346287750

ECM

Estimated T-Level: 32.1 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	7020	0
Verified		Unknown	7020	0
Verified		Brian J. Beesley	AF18BF2F05C1F020	0
Verified		Eivind Triel	AF18BF2F05C1F020	101674
Verified	2001-12-01	Brian J. Beesley	AF18BF2F05C1F020	243703

History

Date	User	Type	Result
2023-10-29	tim s	NF	no factor from 2^67 to 2^68
2023-03-22	tim s	NF	no factor from 2^66 to 2^67
2023-02-05	masser	NF-PP1	Start=6/5, B1=20000000, B2=620000000
2023-01-28	masser	NF-PP1	Start=88/53, B1=20000000, B2=620000000
2023-01-27	masser	NF-PP1	Start=2/7, B1=20000000, B2=620000000
2022-06-21	Sid & Andy	NF-PM1	B1=137000000, B2=2811346287750
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2020-01-06	Gordon Spence	NF	no factor from 2^65 to 2^66
2019-12-20	Yxinity	NF	no factor from 2^65 to 2^66
2018-03-29	Gordon Spence	NF	no factor from 2^64 to 2^65
2018-02-26	BloodERazor	NF	no factor from 2^64 to 2^65
2016-05-13	Numberwang	NF-PM1	B1=3129, B2=78225
2016-05-13	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-02-06	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-02-06	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2013-10-28	David Campeau	NF-PM1	B1=5360000, B2=203680000, E=12
2013-06-29	lycorn	NF	no factor from 2^60 to 2^61
2012-05-08	Joss	NF-PM1	B1=5196635
2012-02-26	Joss	NF-PM1	B1=2165264
2011-07-24	Joss	NF-PM1	B1=1732211
2011-06-27	Joss	NF-PM1	B1=1039327
2009-02-06	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-01	Sturle Sunde	NF	no factor from 2^58 to 2^59

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